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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087b37bc9dad0fc53737e317bdcea525c5d909a59329fa893730ab02b182941c' 
  AND token = 'i9omW+uAw4VQlNJNxS/l1j5xi1npP7vS4I476ZrNTiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}